![]() ![]() SPF allows software to identify and reject forged addresses in the SMTP Mail From (Return-Path). Sender Policy Framework (SPF): Sender Policy Framework is an extension to the Simple Mail Transfer Protocol (SMTP). TXT Record can be used to implement the following: Here, if anybody was checking the TXT Records of, would notice the above text appearing in the TXT Record. You may add a TXT Record for with the value as This is my email server. Multiple TXT Records are permitted but their order is not necessarily retained. This Record is generally used to convey information about the zone. A TXT Record can store upto 255 characters of free form text. This text is meant to strictly provide information and has no functionality as such. Text (TXT) Records (Anchor: deftxt): TXT Records provide the ability to associate some text with a domain or a sub-domain. This A Record is referred to as a Glue Record, because it doesn't really belong in the Parent Zone, but is necessary to locate the DNS Server for the delegated sub-domain. ![]() If an NS Record delegates a sub-domain () to a DNS Server with a name in that sub-domain (), an A Record for that server () must exist in the Parent Zone (). Because of this, it is important that an A Record for the referenced DNS server exists, otherwise there may not be any way to find that DNS server and communicate with it. An NS Record identifies the name of a DNS server, not the IP Address. You can also delegate sub-domains of your own domain name (such as ) to other DNS servers. ![]() Delegation implies that part of a domain is delegated to other DNS servers. The most important function of the NS Record is Delegation. These NS Records have the same name as the Zone in which they are located. This mostly is used for Zone Transfer purposes (notify). ![]() A Zone should contain one NS Record for each of its own DNS servers (primary and secondary). Name Server (NS) Record (Anchor: defns): NS Records identify the DNS servers responsible (authoritative) for a Zone. In such cases, a CNAME Record maybe used to forward traffic to their actual website.Ĭould be CNAME to The most popular use of the CNAME Record, is to provide access to a Web Server using both the standard and (without the CNAME Records can also be used when a computer or service needs to be renamed, to temporarily allow access through both the old and new name. Sometimes companies register multiple domain names for their brand-names but still wish to maintain a single website. To mask this, CNAME Records can be used, to give a single computer multiple names (aliases). Often computers on the Internet have multiple functions such as Web Server, FTP Server, Chat Server, etc. Email servers will attempt to deliver email to the server with the lowest preference number first, and if unsuccessful continue with the next lowest and so on.Ĭanonical Name (CNAME) Record (Anchor: defcname): CNAME Records are domain name aliases. Then it looks up the A Record for the email server to connect to its IP address.Īn MX Record has a Preference number, indicating the order in which the email server should be used. When sending an email to, your email server must first looks up the MX Record for xyz.com to see which email server actually handles email for xyz.com (this could be or someone else's email server like ). Mail Exchanger (MX) Record (Anchor: defmx): An MX Record identifies the email server(s) responsible for a domain name. This needs to be set as an A Record or an AAAA Record respectively, for that particular domain name. When you host your domain name with a Web Hosting company, you will be provided with either an IPv4 Address or an IPv6 Address. ![]()
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